Malicious PDF — malware analysis report

Static analysis result for SHA-256 37582e145eea050a…

MALICIOUS

PDF

85.6 KB Created: 2021-07-06 16:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 25a9a08dc59a4ea5028fb8a7cc95941e SHA-1: 239890a30175393ec1b3830446f0addec7b12cd0 SHA-256: 37582e145eea050ab64c413d80b89d481dad82eaccdfd42c87420df4f9b29192
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous external URIs pointing to compromised CMS uploads and disposable hosting domains. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lure users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=how+to+wash+your+tie+dye+shirt PDF link annotation
    • http://asja-doll.ru/userfiles/file/panikisanewa.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/gopatojumet.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6m350t26e940j91vbs1jop0881/tiwilif.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/58327547518.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b89b8bc25f---xakaxajotiw.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/12056432244.pdfIn PDF document text
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/podoxudipalegademebizog.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/1e0d5c7aa8552379012ef2edabd844b1/polozolunamot.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/45f79b0a9709f93a268b6278171f8e77/wozar.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/attje5dqaoeb4tshsr7mjgs650/xutijulizirojodugifuwim.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/3594457183.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/33226940504.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/46545278413.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/16373191498.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/janigufunipuvasideje.pdfIn PDF document text
    • http://swissfun.tv/var/www/porn4me.ch/web/ckfinder/userfiles/files/33872782532.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a418d426d---jojoma.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/35473755334.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dabbac255e5---sixugumutanefavufa.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/32397497447.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/6fd3d2d121cb5c3bd1b896196f450679/47254105368.pdfIn PDF document text
    • https://soechi.id/userfiles/file/buzowozenitoguvobaki.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105250833348881.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/9i2dts7mcjgvd6pr8mkiihq4c9/95028442676.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c04b1ac7c0e---pujiwananotefokagaki.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/gafugosopo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 16896 bytes
SHA-256: 3e01af6b65b8c9dd47ba9d403b2f1401ca04868a2f4100a0ab0119b50727ffe9
font_02_sfnt_off00012f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4B 10484 bytes
SHA-256: b182748c716cf5d2173aa2ac6fd9c471713446ca97a292bae756d4bace119363

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